In this photo taken Oct. 9, 2015, Democratic presidential candidate Sen. Bernie Sanders, I-Vt. speaks in Tucson, Ariz.
In this photo taken Oct. 9, 2015, Democratic presidential candidate Sen. Bernie Sanders, I-Vt. speaks in Tucson, Ariz. Rick Scuteri AP
In this photo taken Oct. 9, 2015, Democratic presidential candidate Sen. Bernie Sanders, I-Vt. speaks in Tucson, Ariz. Rick Scuteri AP